Vista only adds the file format to the text, if you haven’t already. Therefore, if your filter is "All supported formats | * .jpg; *. Bmp; ...", then it will automatically add it, but if it is "All supported formats (*. *) | *. *", Then it does not "t. It checks for the presence of a wildcard, but does not verify that they match, so any of these approaches will work:
"All Supported Formats (*.*)|*.jpg;*.bmp;*.gif"
"All Supported Formats (*.jpg;...)|*.jpg;*.bmp;*.gif"
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